The equivalent resistance between the points P and Q in the network given here is equal to (given r = )
|
(a) |
(b) 1 W |
(c) |
(d) 2 W |
The equivalent resistance between the points P and Q in the network given here is equal to (given r = )
|
(a) |
(b) 1 W |
(c) |
(d) 2 W |
(b) 1 W
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In a Young's double slit experiment, the fringe width will remain same, if (D = distance between screen and plane of slits, d = separation between two slits and λ = wavelength of light used)
|
(a) Both λ and D are doubled |
(b) Both d and D are doubled |
|
(c) D is doubled but d is halved |
(d) λ is doubled but d is halved |
Consider the following two statements A and B and identify the correct choice given in the answers
(A) Duddells thermo-galvanometer is suitable to measure direct current only
(B) Thermopile can measure temperature differences of the order of
|
(a) Both A and B are true |
(b) Both A and B are false |
|
(c) A is true but B is false |
(d) A is false but B is true |
A magnet oscillating in a horizontal plane has a time period of 2 second at a place where the angle of dip is 30o and 3 seconds at another place where the angle of dip is 60o. The ratio of resultant magnetic fields at the two places is
|
(a) |
(b) |
(c) |
(d) |
A cell of e.m.f. E is connected with an external resistance R, then p.d. across cell is V. The internal resistance of cell will be
|
(a) |
(b) |
(c) |
(d) |
A piece of cloud having area 25
and electric potential of
volts. If the height of cloud is 0.75 km, then energy of electric field between earth and cloud will be
|
(a) 250 J |
(b) 750 J |
(c) 1225 J |
(d) 1475 J |
The ratio of intensities of consecutive maxima in the diffraction pattern due to a single slit is
|
(a) 1 : 4 : 9 |
(b) 1 : 2 : 3 |
(c) 1 : |
(d) 1 : |
$\text{v}\geq\text{v}_0$
$\text{v}>2\text{v}_0$
$\text{v}<\text{v}_0$
$\text{v}<\frac{\text{v}_0}{2}$
Magnetic lines of force due to a bar magnet do not intersect because
|
(a) A point always has a single net magnetic field |
|
(b) The lines have similar charges and so repel each other |
|
(c) The lines always diverge from a single point |
|
(d) The lines need magnetic lenses to be made to intersect |
A rectangular coil 20 cm × 20 cm has 100 turns and carries a current of 1 A. It is placed in a uniform magnetic field B = 0.5 T with the direction of magnetic field parallel to the plane of the coil. The magnitude of the torque required to hold this coil in this position is
|
(a) Zero |
(b) 200 N-m |
(c) 2 N-m |
(d) 10 N-m |